Oil heater



`une ,16, 1925.

J. PRBMROSE OILHEATER Filed March 19, YV19123 2 Sheets-Sheet 2 @mounten Patented June 16, 1925.

UNITED STATES PATENT OFFICE.

CMPANY, 0F NEW YORK, N. Y.,

A CORPORATION OF NEW'YORK.

OIL HEATER..

Application tiled March 19, 1923.. Serial No. 626,239.

vented certain new and useful Improve' ments in Oil Heaters, of which the following is a full, clear, and exact description.

This `invention relates to improvements in oil heaters and is particularly directed to a construction of heater which 1s capable of handling large quantities of oil and raising the temperature thereofv to the desired amount.

Provision is made for absorbing the max# imum amount of heat from the hot gases without.. however, overheating the oil at any point in the heater.

To this general end I have devised a novel disposition of the heating surfaces in the heater and have protected such portions as are subject to excessive radiant heat by tile. I have further provided a novel circulating path for the oil'through the heater so that the maximum amount of heat is absorbed.

In the drawings,

Fig. 1 is a sectional view of my improved heater.

Fig. 2 is a detail view and its encircling protecting tile.

Fig. 3 is a front view of the heater and shows the distributing manifold or header construction. h l

The furnace walls are of ordinary construction and a bridge wall 10 is built up to divide the furnace into two chambers 11 and 12. The source ofheat is applied within the furnace chamber and may be a coal fire or gas or fuel oil iame. From the furnace chamber the hot ases pass over the bridge through the heating chamber 12 and thence out of the apparatus through a duct 13.

The oil-conveying parts of the heater comprise a central outlet manifold 14 connected to a central vertically extending header 15. This header receives oil through laterally extending pipes 16 which in turn are connected at their outer ends into vertical or end headers 17. Thetubes 16 extend substantially over the entire front wall of the furnace and are protected against the effect of high radiant heat by encircling tile 18, as shown in Fig. 2. U-shaped conduits 19 connect each of the headers with a trans showing one tube verse horizontal header 20 into which roof i tubes 24 are fitted. The tubes 24 extend across the roof of the furnace and connect through individual junction boxes 22 with vertical tile covered tubes 22a which are located in the rear wall of the furnace.- The portions of the tubes 24 which are directly exposed to the heat of the furnace chamber are preferably protected by encircling brick tile, such as 18, and the remaining portions of the tubes are preferably encased in blocks 23 of cast iron. The pipes 22a convey the oil t0 the junction boxes from the bank of heating tubes 25 which receive oil from inlet header 26. The tube bank .25` is preferably formed of a plurality of superimposed tubes, eachhaving corrugated cast iron casings thereon and having the usual connecting headers or couplings at their ends. This bank of heating elements 25 receives heat by convection from the passing hot gases and the upper tubes of the bank are protected against burning out by excessive radiant heat from the roof by the provision of the opposed heating surface in the roof. This feature of thejapparatus per se is not herein claimed as it forms the subject matter of my copending application Serial Number 482,135.

Itv will be observed that all portions of the tubes 16 and 24 which are directly exposed to the flames in the furnace chamber and the highly vheated radiant walls of the bridge wall are protected by encircling brick tile 18. This tile prevents the oil in these tubes from being overheated and also prevents so-called hot spots from forming on the tubes themselves. The tile and tubes together form the entire front wall and roof of the furnace. l

The oil in passing through the pipes in the roof and front wall of the furnace cool these parts ofthe apparatus and prevent overheating thereof. At the same time heat which otherwise would be dissipated outside the furnace is usefully recovered by the oil.

In certain cases it may be desirable to reverse the direction of How of the oil through the apparatus. The oil would then be supplied at 14 and drawn od at header 26.

construction permite ready acc tetlue ilul posed in thel ner headers for inspection or replacement. Furthermore the removal of one or more tubes is facilitated since any desired inner headers can b e removed from inside the bridge wall and thereafter the desired tubes the entire wall may possibly become radiant and thus overheat the oil in tubes 25. By allowing air to have access to the interior ofthe bridge Wall, this objectionable overheating is obviated.

What I claim is:

1. An oil heater comprising in combination with a central vertical header, of a bank of oil conveying pipes extending laterally from said header, a pair of vertical headers at the ends of said pipes, a horizontal header with a bank of tubes connected'thereto', disposed above said first mentioned bank of pipes, connections from said horizontal header to the aforesaid pair .of vertical headers, a bank of tubes disposed in the path of heated gases and connections from said bank of tubes to the bank of tubes which are connected to the horizontal header. i

2. An oil heater comprising a furnace chamber with a bridge wall therein to divide the same into a furnace and a tube chamber, a bank of tubes having encircling tile'thereon forming the frontwall of thev furnace chamber, a second bank of tubes having encircling tile and cast. iron blocks thereon to form the roof of the furnace, a third bank of tubes in the tube chamber dispath of hot gases flowing therethrough, and means connecting the first and second and the second and third banks of tubes.

3. An oil heater comprising a furnace chamber, a front wall therefor, comprised of a divided bank of tubes, a header disposed intermediate said tube-s a'nd connected thereto, a second bank of tubes forming the roof of the furnace chamber, a header therefor connected to said tubes which form the front wall 'of the furnace chamber, and a.

third bank of tubes disposed in the path of hot gases to which the aforesaid second bank of tubes are connected'. t

4. An oil heater comprising a plurality of horizontally extending vertically superimposed tubes adapted to form one wall of a furnace chamber, a second bank of horizontally extending tubes disposed side by.`- side forming the roof of the furnace chamber, a third bank of tubes disposed in the path of hot gases, and encircling tile for all the tubes of the first mentioned wall and for a portion of the roof tubes to protect the same and the oil therein from the direct effects of radiant heat.

5. An oil heater comprising a chamber, a hollow bridge wall therein to divide the same into a furnacechamber and a tube chamber, a bank of. heat absorbing tubes disposed in the tube chamber, said tubes having header connections at one end projecting through an opening in the hollow bridge wall so as to be accessible from the g prevent parts of the same adjacent the tube chamber from becoming overheated.

7. An oil heater comprising a furnace chamber and a tube chamber, a bank of tubes having encircling tile thereon and defining one wall of the furnace( chamber, a second bank of tubes disposed at the roof ofI both chambers, said tubes being in part encased by encircling tile, a. third bank of tubes in the heating chamber disposed in the path of hot gases owing therethrough, and means connecting the first and second and the second and third banks of tubes. 8. An oil-heater comprising a plurality of horizontally extending vertically superimposed tubes disposed to define one wall of a furnace chamber, a second bank of horizontally extending tubes disposed side by side and defining the roof of the furnace chamber, a third bank of tubes disposed in `1the path of the hot gases and cast iron casings upon a portion of saidroof tubes and said tubes in the path of thel hot gases for the purpose described. -I

In testimony whereof I hereto aix my signature. 

